What are the structural and chemical reasons why bile salts don’t form typical micelles?

What are the structural and chemical reasons why bile salts don’t form typical micelles?
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Answer :

Although bile salts possess a polar head group, the hydrocarbon tail usually contains polar hydroxyl groups. Therefore the rigid ring system gives a tightly packed, almost solid, nonpolar phase rather than a liquid one. However, like cholesterol, bile salts can form mixed micelles with phospholipids. 
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